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Toxicology tests are being carried out but the results are not expected for a number of weeks and no further details about those involved have been made available.

Detective Chief Inspector Richard Ocone said: "At this stage we are uncertain if these deaths are linked to the same type of drug or not but we are investigating that possibility along with the issue of whether there is anything unusual about that drug.

"While we do not condone the use of drugs, we do have a responsibility to protect everyone in our community and to make them aware of any risks posed to them.

"We would, therefore, advise all drug users to be extra careful and be mindful of the three recent deaths."